He said that inflow will be the most important but I should have no issues with 50lbs of fish per gallon and said I should be able to put at least 150-200lbs of speckles in the tank pumping in 4gpm of well water and recirculating another 4gpm thru the degasser if I wanted to do so.
Ryan,
Just keep in mind there comes a point if density is increased enough -- when although the fish seem to live and feed well -- their fin quality starts to degrade. It's not an issue with food fish or even fish and game departments (I think we've all see the ragged fins on raceway trout).
This is something I have to be careful of when I change over to all RAS vs. the earthen pond I have my trout in. If my trout have any flaws the price I can get drops considerably.